Single valve ready to use hose end sprayer

ABSTRACT

The present invention relates to a chemical sprayer that includes a sprayer head assembly and a container. The container defines a cavity for storing a chemical to be sprayed. The sprayer head assembly includes a chemical passage, a carrier fluid passage, a vent passage, a valve chamber and a valve. The chemical passage is communication with the cavity. The carrier fluid passage is in communication with a carrier fluid source. Both the carrier fluid and chemical passages are in communication with the valve chamber. The valve is moveably positioned within the valve chamber and defines at least partially a first passage and a second passage. The first passage is configured so as to be in communication with the chemical passage when the valve is in an open position. The second passage is configured so as to be in communication with the carrier fluid passage when the valve is in the open position. The first and second passages are also configured so as to not be in communication with the chemical and carrier fluid passages when said valve is in a closed position. The valve also includes one or more seal portions positioned on the valve so as to block both the chemical and the carrier fluid passages when said valve is in the closed position. The sealing portions also preferably blocks a vent passage when the valve in the closed position. The second passage also preferably forms at least in part an outlet of the sprayer head assembly. A suction generating surface is also preferably defined by the valve.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to chemical dispensing sprayersand, in particular, to aspiration-type sprayers that use a relativelylarge amount of carrier fluid for dispensing a relatively small amountof a chemical solution.

[0003] 2. Description of the Related Art

[0004] Every year consumers apply thousands of gallons of chemicals suchas fertilizers or pesticides to plants, lawns, flowers, vegetablegardens and other organic type vegetation. Typically, such chemicals aresold in plastic containers in a concentrated form. While in thisconcentrated form, the chemical is extremely hazardous to the consumerend user and the environment in general. Accordingly, the containertypically includes an aspiration-type sprayer head assembly. Anaspiration-type sprayer uses a relatively large amount of carrier fluid,such as water, to withdraw, dilute and dispense a relatively smallamount of chemical from the container. To further prevent harm to theconsumer, the container and the sprayer head assembly are preferablydisposed of after the container's contents are exhausted. It istherefore desirable to provide a sprayer head assembly that issufficiently low cost so as to allow the entire unit to be discarded andyet reliable and safe.

SUMMARY OF THE INVENTION

[0005] It is therefore an object of the invention to provide a safe andreliable aspiration type chemical sprayer that utilizes a minimum numberof components and that is relatively easy to manufacture and assemble.

[0006] Accordingly, one aspect of the present invention involves achemical sprayer that comprises a sprayer head assembly and a container.The container defines a cavity for storing a chemical to be sprayed. Thesprayer head assembly includes a chemical passage, a carrier fluidpassage, a valve chamber and a valve. The chemical passage is incommunication with the cavity. The carrier fluid passage is incommunication with a carrier fluid source. Both the carrier fluid andchemical passages are in communication with the valve chamber. The valveis moveably positioned within the valve chamber and defines at leastpartially a first passage and a second passage. The first passage isconfigured so as to be in communication with the chemical passage whenthe valve is in an open position. The second passage is configured so asto be in communication with the carrier fluid passage when the valve isin the open position. The first and second passages are also configuredso as to not be in communication with the chemical and carrier fluidpassages when said valve is in a closed position. The valve alsoincludes one or more seal portions positioned on the valve so as toblock both the chemical and the carrier fluid passages when said valveis in the closed position.

[0007] Another aspect of the of the present invention involves achemical sprayer comprising a sprayer head assembly and a container. Thecontainer defines a cavity for storing a chemical to be sprayed. Thesprayer head assembly includes a chemical passage that is incommunication with the cavity. The assembly also includes a carrierfluid passage that is in communication with a carrier fluid source. Theassembly further includes a valve and a valve chamber. The valve chamberis in communication with the chemical and carrier fluid passages. Thevalve is moveably positioned within the valve chamber. The valve definesat least in part a first passage that is in communication with thechemical passage when the valve is in an open position. The valve alsodefines at least in part a second passage that is in communication withthe carrier fluid passage when the valve is in the open position. Thevalve also includes a suction generating surface. The first passage hasa mouth at the suction generating surface. The suction generatingsurface is positioned and configured such that the flow of carrier fluidover the suction generating surface creates a suction that drawschemical through the chemical passage to the mouth.

[0008] Yet, another aspect of the present invention involves a chemicalsprayer comprising a sprayer head assembly and a container. Thecontainer defines a cavity for storing a chemical to be sprayed. Thesprayer head assembly includes a chemical passage, a carrier fluidpassage, a valve chamber, a valve, and an outlet. The chemical passageis in communication with the cavity. The carrier fluid passage is incommunication with a carrier fluid source. The valve chamber is incommunication with the chemical and carrier fluid passages. The valve ismoveably positioned within the valve chamber. The valve defines at leastin part a first passage that communicates with the chemical passage whenthe valve is in an open position. The chemical passage terminates at asuction generating surface that is defined by the valve. The suctiongenerating surface is positioned and configured such that the flow ofcarrier fluid over the suction generating surface creates a suction thatdraws chemical through the chemical passage to the suction generatingsurface. The outlet for the carrier fluid and the chemical is formed atleast in part by the valve.

[0009] Yet another embodiment of the present invention involves achemical sprayer comprising a sprayer head assembly and a container. Thecontainer defines a cavity for storing a chemical to be sprayed. Thesprayer head assembly comprises a chemical passage that is incommunication with the cavity and a carrier fluid passage that is incommunication with a carrier fluid source. A valve chamber is incommunication with the chemical passage. A valve is moveably positionedwithin the valve chamber. The valve defines at least in part a firstpassage that communicates with the chemical passage when the valve is inan open position. The valve also defines a metering orifice that is incommunication with the first passage.

[0010] Another embodiment of the present invention involves a chemicalsprayer comprising a sprayer head assembly and a container. Thecontainer defines a cavity for storing a chemical to be sprayed. Thesprayer head assembly comprises a chemical passage that is incommunication with the cavity. A carrier fluid passage is incommunication with a carrier fluid source. A valve chamber is incommunication with the chemical passage. A valve is moveably positionedwithin the valve chamber. The valve defining at least in part a firstpassage that is in communication with the chemical passage when thevalve is in an open position. The valve further includes one or moresealing portions that form an annular seal around the chemical passagewhen the valve is in the open position.

[0011] All of these embodiments are intended to be within the scope ofthe invention herein disclosed. These and other embodiments of thepresent invention will become readily apparent to those skilled in theart from the following detailed description of the preferred embodimentshaving reference to the attached figures, the invention not beinglimited to any particular preferred embodiment(s) disclosed.

[0012] For purposes of summarizing the invention and the advantagesachieved over the prior art, certain objects and advantages of theinvention have been described herein above. Of course, it is to beunderstood that not necessarily all such objects or advantages may beachieved in accordance with any particular embodiment of the invention.Thus, for example, those skilled in the art will recognize that theinvention may be embodied or carried out in a manner that achieves oroptimizes one advantage or group of advantages as taught herein withoutnecessarily achieving other objects or advantages as may be taught orsuggested herein.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] These and other features of the invention will now be describedwith reference to the drawings of the preferred embodiments, which areintended to illustrate and not to limit the invention, and in which:

[0014]FIG. 1 is a perspective view sprayer head assembly that isattached to a chemical container; the sprayer head assembly havingcertain features and advantages that are in accordance with theprincipals of the present invention;

[0015]FIG. 2 is side view of the sprayer head assembly of FIG. 1 in aclosed position;

[0016]FIG. 3 is side view of the sprayer head assembly of FIG. 1 in anopen position;

[0017]FIG. 4 is a top view of the sprayer head assembly of FIG. 1;

[0018]FIG. 5 is a bottom view of the sprayer head assembly of FIG. 1;

[0019]FIG. 6 is a cross-sectional view of the sprayer head assembly inthe closed position taken along line 6-6 of FIG. 4;

[0020]FIG. 6A is an enlarged view of a portion of the sprayer headassembly of FIG. 6;

[0021]FIG. 7 is a cross-sectional view of the sprayer head assembly inthe open position taken along line 7-7 of FIG. 4;

[0022]FIG. 7A is an enlarged view of a portion of the sprayer headassembly of FIG. 7;

[0023]FIG. 8 is another side view of a different side of the sprayerhead assembly of FIG. 2;

[0024]FIG. 9 is a front view of the sprayer head assembly of FIG. 1;

[0025]FIG. 10A is a perspective of the control valve having certainfeatures and advantages according to the present invention;

[0026]FIG. 10B is an side view of the control valve of FIG. 10A;

[0027]FIG. 10C is another side view from a different side of the controlvalve of FIG. 10A;

[0028]FIG. 10D is a bottom view of the control valve of FIG. 10A;

[0029]FIG. 11A is a side view of a sealing member having certainfeatures and advantages according to the present invention;

[0030]FIG. 11B is a front view of the sealing member of FIG. 11A

[0031]FIG. 11C is a rear view of the sealing member of FIG. 11A;

[0032]FIG. 12A is a cross-sectional view taken along line 12A-12A ofFIG. 1B; and

[0033]FIG. 12B is a cross-sectional view taken along line 12B-12B ofFIG. 11B.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0034] A sprayer head assembly 10 according a preferred embodiment ofthe present invention is illustrated in FIGS. 1-12B. As shown in FIG. 1,the sprayer head assembly 10 is connected to a chemical container 12.The sprayer head assembly 10 includes a sprayer head 14, a containerconnection portion 16, a supply fluid connection portion 18, and arotatable control valve 20. The sprayer head assembly 10 may be made ofany suitable material that is resistant to and compatible with thechemical fluid to be sprayed. However, a flexible plastic material, suchas polypropylene, is preferred because it is resilient yet durable.

[0035] With reference to FIGS. 1 and 6, the valve 20 is moveablypositioned in a cylindrical bore 22 that is formed in the sprayer head14 of the sprayer head assembly 10. The valve includes a gripping areaor handle 24 that is mounted onto a valve cap 21. An operator opens andcloses the valve 20 by twisting the handle 24. The valve 20, bore 22,and handle 24 are illustrated as being arranged substantially about ahorizontal axis. This horizontal arrangement of the valve 20, bore 22,and handle 24 is preferred because it allows the operator to rotate thevalve 20 in an ergonomical position. That is, the operator can hold thecontainer 12 in one hand and rotate the valve 20 with the other handwithout excessive rotation and lifting of the elbows and shoulders. Incomparison, if the valve 20 is arranged in a vertical position, theoperator typically has to lift and twist the operator's shoulders andelbows in order to rotate a valve 20. However, those of ordinary skillin the art will recognize that many of the aspects of the presentinvention may be achieved with the valve 20 arranged along anon-horizontal axis. The construction the valve 20 and bore 22 will bedescribed in more detail below.

[0036] With continued reference FIGS. 1 and 6, the connection betweenthe sprayer head assembly 10 and the container can be achieved byproviding the container connection portion 16 with a conventionalrotatable coupler 26 and a washer 28. The rotatable coupler 26 includesinternal threads 30 that cooperate with corresponding threads (notshown) formed on the neck of the container 12.

[0037] The sprayer head assembly 10 can also be permanently attached tothe container 12. In such an arrangement, adhesive can be applied to theinner surface of the connection portion 16 before it is fitted over theneck of the container 12. Alternatively, the connection portion 16 caninclude an inwardly projecting ratchet that opposes a cooperatingratchet formed on the container 12.

[0038] When the sprayer head assembly 10 is installed onto the container12, the interior of the container 12 is in communication with a chemicalpassage 32 that is also in communication with the interior of thecylindrical bore 22. In the illustrated arrangement, the chemicalpassage 32 is defined in part by a downwardly depending chemical flowtube or dip tube 34. The dip tube 34 extends into the container 12 andpreferably terminates near a bottom surface of the container. Thechemical passage 32 is also defined in part by an internal passage 38,which is formed in the sprayer head 14. The internal passage 38communicates with the interior of the cylindrical bore 22 and the diptube 34. The dip tube 34 is secured in fluid communication with theinternal passage 38 by a sleeve 36. Although, in the illustratedarrangement the chemical passage 32 is defined by two components (thedip tube 34 and the internal passage 38), it should be appreciated thatthe chemical passage 32 can be defined by a single component or morethan two components. The illustrated arrangement, however, is preferredbecause it is easy to manufacture and yet uses a small number ofcomponents.

[0039] Preferably, the sprayer head assembly 10 includes a vent passage52, which is shown in FIG. 5. In the illustrated arrangement, the ventpassage 52 is defined by a small hole formed in the head 14 of theassembly. As with the chemical passage 32, the vent passage 52communicates with the interior of the container 12 when the assembly 10is mounted onto the container 12. The vent passage 52 extends up throughhead 14 and communicates with the interior of the cylindrical bore 22.The vent passage 52 lies generally parallel to (and spaced along theaxis of the valve from) the interior passage 32. Although, in theillustrated arrangement the vent passage 52 is formed on the assembly10, it should be appreciated that the vent passage 52 can be located onthe container 12. However, the illustrated arrangement is preferredbecause, as will be explained below, it enables the vent passage 52 tobe opened and closed with the chemical passage 32.

[0040] As mentioned above, the sprayer head assembly 10 also includes asupply fluid connection portion 18 (see FIG. 6). The supply fluidconnection portion 18 connects the assembly to a pressurized supplyfluid source (not shown), such as, for example, a garden hose. In theillustrated arrangement, the connection is formed by a conventionalrotatable coupler 40 and a washer 42. The coupler 40 includes threads 44that cooperate with corresponding threads (not shown) formed on thesupply fluid source. One of ordinary skill in the art will appreciatethat other means can be used to connect the assembly 10 to the supplyfluid source.

[0041] With continued reference to FIG. 6, the sprayer head assembly 10includes a supply passage 46. The supply passage 46 is in communicationwith the supply fluid source and the interior of the bore 22. In theillustrated arrangement, the supply passage 46 is defined in part by aside wall 48 of the sprayer head 14. The side wall 48 extends from thecoupler 40 towards the cylindrical bore 22. The supply passage 46 isalso defined in part by an elongated constriction passage 50, which inthe preferred embodiment directly communicates with the cylindrical bore22. The elongated constriction passage 50 helps to produce a uniform,non-turbulent stream of carrier fluid into the bore 22. In theillustrated arrangement, the side wall 48 and the elongated constrictionpassage 50 are integrated together. However, it should be appreciatedthat the these components can be made separately. It should also beappreciated that the supply passage 46 can be defined by a singlecomponent or more than two components, which can be integrated togetheror made separately. The illustrated arrangement is preferred because itis relatively simple to form and produces the desired uniform stream ofcarrier fluid.

[0042] As best seen in FIGS. 10A-D, the valve 20 is constructed with twoouter walls 54 that define a cylindrical periphery for slidingengagement with the interior wall of the cylindrical bore 22 (FIG. 6).Preferably, the outer wall 54 nearest the handle 24 engages an annulargroove 51 (shown in dashed lines in FIG. 4) that is formed along theinterior wall of the cylindrical bore 22. Accordingly, the valve 20 isinserted into the sprayer head 14 by snap-fitting the valve 20 into theannular groove 51. Once snap-fitted, the valve 20 can rotate within thecylindrical bore 22 but is secured axially by the engagement of theouter wall 54 with the annular groove 51. The bore 22 is closed at oneend by a bore cover 23 (see FIG. 8) that is preferably integrated withthe assembly head 14. The bore 22 is closed at the other end by thevalve cap 21.

[0043] In order to reduce the amount of material used in the valve 20,the valve 20 is preferably hollowed out. That is, several gaps 55 areformed in the body of the valve 20. These gaps 55 are positioned so asnot compromise the structural integrity of the valve 20.

[0044] As will be explained below, the valve 20 controls the flow ofchemical through the assembly 10. The valve 20 also preferably controlsthe flow of supply fluid through the assembly 10. More preferably, thevalve 20 also controls the communication of the vent passage 52 withatmospheric pressure.

[0045] Accordingly, as best seen in FIG. 7, the valve 20 defines atleast in part a first passage 56. The first passage 56 is configured andpositioned within the valve 20 such that when the valve 20 is an openposition (i.e., the position shown in FIG. 7) the first passage 56 isaligned with and communicates with the chemical passage 32. Preferably,the first passage 56 has a diameter that is slightly larger than thediameter of the internal passage 38. This arrangement helps to align thefirst passage 56 with the internal passage 38.

[0046] As best seen in FIG. 7A, the first passage 56 preferablycommunicates with a generally cylindrical metering orifice 74 thatterminates at a generally cylindrical mouth 75. The mouth 75 is locatedwithin a graduated suction generating recess 76, which is formed on asuction generating surface 57. Preferably, the valve 20 defines themetering orifice 74, the mouth 75, the suction generating recess 76 andthe suction generating surface 57. However, it should be appreciatedthat several advantages of the present invention can be achieved in anarrangement where the metering orifice 74, the mouth 0.75, the suctiongenerating recess 76 and/or the suction generating surface 57 are notdefined by the valve 20. The illustrated arrangement is preferredbecause, as will be explained in more detail below, the metering orifice74 and the mouth 75 can be more accurately manufactured.

[0047] The diameter of the metering orifice 74 and mouth 75 determines,for the most part, the dilution ratio of the sprayer head assembly 10.The method for determining the diameter of the metering orifice andmouth 75 to achieve a desired dilution ratio are well known to those ofordinary skill in the art; therefore, a detailed description of such amethod is not necessary.

[0048] As best seen in FIG. 10B, the suction generating surface 57defines the graduated suction generating recess 76. The recess 76 has agenerally triangular shape that is formed by two side walls 77 and arounded end wall 79. The mouth 75 of the metering orifice lies on alower face 81 of the recess 76 near the rounded end wall 89. The recess76 is deepest at the apex where the mouth 75 of the metering orifice 74is located. The graduated suction generating recess 76 is sized andconfigured, as is well known in the art, so that when carrier fluidflows over the 76 recess a suction force is created. The suction forcedraws the chemical from the container 12 through the chemical passage32. Of course, one of ordinary skill in the art will recognize that thedesired suction force can be created with graduated suction generatingrecesses of other shapes and sizes.

[0049] As best seen in FIG. 7A, the valve 20 also defines, at leastpartially, a second passage 58 that is aligned with the supply passage46 when the valve 20 is in the open position. The second passage 58 ispreferably defined by the suction generating surface 57, the innersurface of the cylindrical bore 22, and a pair of side walls 60 (seeFIG. 10B) that are defined by the valve 20. It should also beappreciated that the second passage 58 can be defined entirely by thevalve 20. That is, interior surface of the cylindrical bore 22 can bereplaced, wholly or in part, by an additional wall of the valve 20.However, the illustrated arrangement is preferred for several reasons.For example, this arrangement reduces the amount of material need toform the valve 20.

[0050] With continued reference to FIG. 7A, the valve 20 includes asealing portion 63 that forms an annular seal with the bore 22 aroundthe interface between the chemical passage 32 and the first passage 56.Accordingly, the connection between the chemical passage 32 and thefirst passage 56 is sealed and chemical is prevented from leaking intothe gaps between the valve 20 and the cylindrical bore 22.

[0051] The sealing portion 63 is preferably formed from a separatesingle sealing member 64 (see also FIGS. 11 and 12) that is positionedwithin a recess 70 (see FIG. 10C) formed on the valve 20. The sealingmember 64 is preferably made of a soft plastic elastomer material orother suitable synthetic rubber material. Such material provides aneffective seal with the bore 22, which as mentioned above is preferablymade of a harder plastic material. The sealing member 64 defines atleast in part a transition passage 66, which defines part of the firstpassage 56. Accordingly, the transition passage 66 is in communicationwith the chemical passage 32 when the valve 20 is in the open position.

[0052] Because the sealing surface 63 is positioned on the valve 20, itis much easier to assemble the assembly 10 as compared a sprayer wherethe sealing surfaces are located on the head 14. Such a sprayer isparticularly difficult to assemble such a sprayer because it isdifficult to reach the interior surfaces of the head. This arrangementalso eliminates the need for multiple O-rings on the valve.

[0053] Preferably, the sealing member 64 also preferably includes achannel or recess 67 (see FIG. 12B) that at least partially surroundsthe opening of the transition passage 66. This recess 67 helps to alignthe transition 66 and chemical passages 32.

[0054] With reference to FIGS. 1B and 12A, the sealing member 64 alsopreferably includes a vent channel 68. When the valve is at the openposition, the channel 68 is aligned with the vent passage 52.Accordingly, the channel 68 allows the vent passage 52 to be incommunication with gaps that are formed between the valve 20 and thecylindrical bore 22. Accordingly, when the valve 20 is in the openposition, the vent passage 52 is in communication with an atmosphericpressure source.

[0055] As best seen in FIG. 6A, the sealing portion 63 is alsopreferably arranged on the valve so as to block both the carrier fluidpassage 46 and the chemical fluid passage 32 when the valve 20 is in theclosed position. The sealing portion 63 also preferably blocks the ventpassage 52. Furthermore, as the valve 20 is rotated to the closedposition (FIG. 6) from an open position (FIG. 7) the sealing portion 63of the valve 20 is preferably positioned such that it remains in contactwith the outlet of the chemical passage 32. In a similar manner, thesealing portion 63 also seals the vent passage 52 as the valve 20 isrotated to the closed position.

[0056] The illustrated sealing portion 63 of the valve 20 is formed froma single sealing member 64 that simultaneously blocks the carrierpassage 46, the chemical passage 32, and the vent passage 52 when thevalve is in the closed position. This arrangement is preferred becauseit reduces the number of parts required to construct the assembly 10.However, it should be appreciated that the sealing portion 63 could beformed from a plurality of sealing members 64 positioned within one ormore recesses positioned on the valve 20. It should also be appreciatedthat, although the illustrated sealing portion 63 is preferably formedfrom a separate sealing member 64, the sealing portion 63 can beintegrated into the valve 20 such that the valve 20 and sealing portion63 comprise a single integrated part.

[0057] In operation when the valve 20 is in the open position (see FIG.7A), a stream of pressurized carrier fluid is discharged into the secondpassage 58. As the carrier fluid flows over the suction generatingsurface 57, a suction force is created that draws chemical through thedip tube 34, transition passage 66, and first passage 56 and into thestream of carrier fluid. The upwardly inclined orientation of thesuction generating surface 57 helps to generate the suction force.Venting is provided through the vent passage 52 (see FIG. 5) and thevent channel 68 (see FIG. 11B).

[0058] Preferably, the chemical and carrier fluid is directly dischargedfrom the assembly through the second passage 58. Accordingly, in orderto produce an effective spray pattern, the channel walls 60 (see FIG.10B) diverge slightly as they extend from the carrier passage 46. Thisconfiguration helps to spread the carrier fluid and chemical stream. Theupwardly inclined orientation of the suction generating surface 57 ofthe valve 20 also helps to direct the chemical and carrier fluid streamaway from the user.

[0059] As best seen in FIG. 7, the assembly 10 preferably includes ahood 19 that extends from the head 14 and the second passage 58. Itshould be appreciated that the hood 19 is not necessary to practice thepresent invention. However, the hood 19 is preferred because it protectsthe operator from water and chemical splatter. It should also beappreciated that an additional outlet nozzle could be added to theassembly 10 to further direct the water and chemical flow. Such a nozzlecan extend from the second passage 58 and would offer additional controlof the carrier fluid and chemical stream. In such an arrangement, one ofordinary skill in the art will recognize that the channel walls 60 donot have to be divergent. The illustrated arrangement is preferred,however, because it reduces the size of the assembly 10 and the numberof components and yet still produces an effective spray pattern.

[0060] When the valve is rotated to the closed position (see. FIG. 6A),the carrier passage 46, chemical passage 32 and the vent passage 52 areall closed by the valve 20. Specifically, the sealing portion 63 of thevalve 20 forms a tight seal over these passages and prevents leakage. Aparticular advantage of the illustrated arrangement is the manner inwhich the sealing portion 63 is supported on the valve 20. As seen inFIG. 6A, the sealing portion 63 is formed by the sealing member 64,which is supported in the recess 70. The recess 70 is formed in asubstantially cylindrical sealing wall 80 of the valve 20. In the closedposition, the sealing wall 80 extends across the carrier fluid passage46. Because the carrier fluid is pressurized, the carrier fluid exerts arelatively large force on the sealing member 64 and the sealing wall 80.This force pushes the sealing wall 80 away from the interior of thebore, which can cause the sealing wall 80 to flex. Flexing of thesealing wall 80 can compromise the seal between the sealing member 64and the carrier fluid passage 46. Accordingly, the valve 20 preferablyincludes a bracing wall 82. As seen in FIG. 6A, the bracing wall 82preferably extends across the carrier fluid passage. More preferably,the bracing wall 82 extends to the two ends of the sealing wall 80. Thebracing wall 82 provides additional support to the sealing wall 0.80 inthe direction of the force exerted by the carrier fluid. Flexing of thesealing wall 80 is therefore minimized and a the tight seal between thesealing member 64 and the carrier fluid passage 46 is maintained.Preferably, the bracing wall 82 also defines the suction generatingsurface 57. This arrangement is preferred because it further reduces thenumber of parts of the assembly 10.

[0061] As mentioned above, the valve 20 can be conveniently operatedwith one hand while the assembly 10, container 12, and hose can becontrolled with the other hand thereby providing a safe spray operation.The assembly 10 also preferably includes childproofing features. Asshown in FIGS. 2 and 3, a tab 92 extends from the connection portion 18and engages an indentation 90 formed on the valve cap 21. When the valve20 is in the closed position (FIG. 2), the tab 92 engages theindentation 90 and secures the valve in the closed position. Therefore,to open the valve 20, the operator must simultaneously pull back the tab92 and rotate the valve 20. This requires a level of strength anddexterity that is typically not possessed by children.

[0062] The illustrated assembly 10 described above is particularlyadapted to be manufactured by injection molding. Because the assembly 10will typically be discarded after the chemical in the container 12 isexhausted, the costs of manufacturing the assembly 10 must be low.Injection molding is a particularly low cost method of making parts outof plastic-type materials. Those of ordinary skill in the art willrecognize that the sprayer head 14, the container connection portion 16,the supply fluid connection portion 18, the sealing member 64 and therotatable control valve 20 can all be formed using injection molding.

[0063] Another advantage of the present invention is that the valve 20defines the metering orifice 74 and the mouth 75. As mentioned above,the diameters of the metering orifice 74 and the mouth 75 determine, forthe most part, the dilution ratio of the sprayer assembly 10.Accordingly, to achieve a precise dilution ratio, tight tolerances areneeded in the metering orifice 74 and the mouth 75. However, in priorart plastic sprayers, the sprayer head typically defines the meteringorifice and mouth. Because the sprayer head is a relatively large partthat is typically formed in a relatively large mold, thermal expansionin the mold makes it difficult to obtain tight tolerances in themetering orifice and mouth.

[0064] In comparison, the valve 20 is a much smaller small part.Accordingly, there is less thermal expansion in the mold for the valve20 as compared to the mold for the sprayer head 14. Accordingly, it iseasier to achieve tight tolerances in the valve 20 as compared to thesprayer head 14. Therefore, because the valve 20 of the presentinvention defines the metering orifice 74 and the mouth 75, it is easierto achieve tight tolerances in the orifice 74 and the mouth 75.Furthermore, because the orifice 74 and the mouth 75 are located in thevalve 20, the dilution ratio of the sprayer head assembly 10 can bechanged by simply changing the valve 20. This provides another importantadvantage.

[0065] To further reduce the cost of a aspirator-type sprayer, it isbeneficial to use a minimum number of parts. The illustrated assembly 10preferably includes only three main parts: the head 14, the controlvalve 20, and the sealing member 64. This represents a great improvementover sprayers that include a plurality of valves, multiple O-rings andmultiple sealing members. Furthermore, the illustrated assembly 10 iseasily assembled. The two main assembling steps are (i) attaching thesealing member 64 to the valve 20 and (ii) snap-fitting the valve 20into the valve chamber 22.

[0066] Because of safety concerns, it is essential that anaspiration-type sprayer not leak. One of ordinary skill in the art willappreciate that the illustrated assembly 10 described above meets thisrequirement. In particular, the arrangement of the sealing member 64 onthe valve 20 adequately prevents chemicals from leaking.

[0067] Although this invention has been disclosed in the context ofcertain preferred embodiments and examples, it will be understood bythose skilled in the art that the present invention extends beyond thespecifically disclosed embodiments to other alternative embodimentsand/or uses of the invention and obvious modifications and equivalentsthereof. Thus, it is intended that the scope of the present inventionherein disclosed should not be limited by the particular disclosedembodiments described above, but should be determined only by a fairreading of the claims that follow.

What is claimed is:
 1. A chemical sprayer comprising a sprayer headassembly and a container that defines a cavity for storing a chemical tobe sprayed; said sprayer head assembly comprising: a chemical passagethat is communication with said cavity; a carrier fluid passage that isin communication with a carrier fluid source; a valve chamber that is incommunication with said chemical and carrier fluid passages; a valvemoveably positioned within said valve chamber at least partiallydefining a first passage and a second passage, said first passage isconfigured so as to be in communication with said chemical passage whensaid valve is in an open position, said second passage is configured soas to be in communication with said carrier fluid passage when saidvalve is in said open position, said first and second passages alsoconfigured so as to not be in communication with said chemical andcarrier fluid passages when said valve is in a closed position; saidvalve further comprising one or more sealing portions positioned so asto block both the chemical and the carrier fluid passages when saidvalve is in said closed position.
 2. A chemical sprayer as in claim 1,wherein said valve includes a sealing wall that extends across saidcarrier fluid passage, said one or more sealing portions are located atleast in part on said sealing wall and said valve further includes abracing wall that is coupled to said sealing wall at least two pointsthat are on opposite sides of said carrier fluid passage.
 3. A chemicalsprayer as in claim 1, wherein said one or more sealing portions do notform a single piece with said valve.
 4. A chemical sprayer as in claim3, wherein said valve includes one or more recesses and said one or moresealing portions are positioned within said one or more recesses.
 5. Achemical sprayer as in claim 1, wherein said one or more sealingportions are formed from a single sealing member.
 6. A chemical sprayeras in claim 1, wherein said one or more sealing portions consists of anelastomer.
 7. A chemical sprayer as in claim 1, wherein said one or moresealing portions forms an annular seal around said chemical passage. 8.A chemical sprayer as in claim 1, wherein said one or more sealingportions are formed from a single sealing member that includes atransition passage that is in communication with said chemical passageand said first passage when said valve is in said open position.
 9. Achemical sprayer as in claim 1, wherein said assembly further includes avent passage that is in communication with said cavity and said valvechamber, said valve is configured such that when in said closed positionsaid valve blocks said vent passage.
 10. A chemical sprayer as in claim9, wherein said one or more sealing portions block said vent passagewhen said valve is in closed position.
 11. A chemical sprayer as inclaim 10, wherein said one or more said sealing portions are formed by asingle sealing member.
 12. A chemical sprayer as in claim 11, whereinsaid sealing member includes a venting channel that is in communicationwith said venting passage and said valve chamber when said valve is insaid open position.
 13. A chemical sprayer as in claim 1, wherein saidsecond passage is defined at least partially by said valve chamber. 14.A chemical sprayer comprising a sprayer head assembly and a containerthat defines an cavity for storing a chemical to be sprayed; saidsprayer head assembly comprising: a chemical passage that is incommunication with said cavity; a carrier fluid passage that is incommunication with a carrier fluid source; a valve chamber that is incommunication with said chemical passage; a valve moveably positionedwithin said valve chamber; said valve defining at least in part a firstpassage that is in communication with said chemical passage when saidvalve is in an open position an a second passage that is also incommunication with said carrier fluid source when said valve is in saidopen position, said valve defining at least in part a suction generatingsurface and said first passage terminating at said suction generatingsurface, said suction generating surface positioned and configured suchthat a flow of carrier fluid over said suction generating surfacecreates a suction force that draws a chemical through said chemicalpassage to said mouth.
 15. A chemical sprayer as in claim 14, whereinsaid valve includes one or more sealing portions positioned on saidvalve such that said one or more sealing portions block said chemicalpassage when said valve is in a closed position.
 16. A chemical sprayeras in claim 15, wherein said one or more sealing portions are alsopositioned on said valve such that said one or more sealing portionsblock said carrier fluid passage when said valve is in said closedposition,
 17. A chemical sprayer as in claim 16, wherein said valvefurther includes a sealing wall that extends across said carrier fluidpassage, said one or more sealing portions are located at least in parton said sealing wall and said valve further includes a bracing wall thatis coupled to said sealing wall at least two points that are on oppositesides of said carrier fluid passage.
 18. A chemical sprayer as in claim15, wherein said one or more sealing portions do not form a single piecewith said valve.
 19. A chemical sprayer as in claim 18, wherein saidvalve includes one or more recesses and said one or more sealingportions are positioned within said one or more recesses.
 20. A chemicalsprayer as in claim 19, wherein said sealing one or more sealingportions consists of an elastomer.
 21. A chemical sprayer as in claim14, wherein said valve includes one or more sealing portions positionedon said valve and said one or more sealing portions forms an annularseal around said chemical passage.
 22. A chemical sprayer as in claim21, wherein said one or more sealing portions are formed from a singlesealing member that includes a transition passage that is incommunication with said chemical passage and said first passage whensaid valve is in said open position.
 23. A chemical sprayer as in claim21, wherein said assembly further includes a vent passage that is incommunication with said cavity and said valve chamber, said valve isconfigured such that when said valve is in a closed position said valveblocks said vent passage.
 24. A chemical sprayer as in claim 23, whereinsaid one or more sealing portions are positioned on said valve so as toblock said vent passage when said valve is in said closed position. 25.A chemical sprayer as in claim 24, wherein said one or more sealingportions includes a venting channel that is in communication with saidventing passage when said valve is in said closed position.
 26. Achemical sprayer comprising a sprayer head assembly and a container thatdefines a cavity for storing a chemical to be sprayed; said sprayer headassembly comprising: a chemical passage that is in communication withsaid cavity; a carrier fluid passage that is in communication with acarrier fluid source; a valve chamber that in communication with saidchemical and carrier fluid passages; a valve moveably positioned withinsaid valve chamber; said valve defining at least in part a first passagethat communicates with said chemical passage when said valve is in anopen position and a second passage that communicates with said supplyfluid passage, said chemical passage terminating at a suction generatingsurface that is formed by said valve, said suction generating surfacepositioned and configured such that the flow of carrier fluid over saidsuction generating surface creates a suction force which draws chemicalthrough said chemical passage to said suction generating surface, and anoutlet for said sprayer head assembly that is formed at least in part bysaid valve.
 27. A chemical sprayer as in claim 26, wherein said suctiongenerating surface is defined at least in part by said second passage.28. A chemical sprayer as in claim 26, wherein said suction generatingsurface is upwardly inclined when said valve is in said open position.29. A chemical sprayer as in claim 26, wherein said outlet includesdivergent walls formed in part by said valve.
 30. A chemical sprayer asin claim 26, wherein said valve includes one or more sealing portionspositioned on said valve so as to block said chemical passage when saidvalve is in a closed position.
 31. A chemical sprayer as in claim 26,wherein said valve includes one or more sealing portions positioned onsaid valve so as to block said chemical and carrier fluid passages whensaid valve is in a closed position.
 32. A chemical sprayer as in claim31, wherein said valve includes a sealing wall that extends across saidcarrier fluid passage, said one or more sealing portions are located atleast in part on said sealing wall and said valve further includes abracing wall that is coupled to said sealing wall at least two pointsthat are on opposite sides of said carrier fluid passage.
 33. A chemicalsprayer as in claim 26, wherein said valve includes one or more sealingportions that form an annular seal around said chemical passage whensaid valve is in said open position.
 34. A chemical sprayer as in claim33, wherein said one or more sealing portions are formed from a singlesealing member that includes a transition passage that is incommunication with said chemical passage and said first passage whensaid valve is in said open position.
 35. A chemical sprayer as in claim33, wherein said assembly further includes a vent passage that is incommunication with said cavity and said valve chamber, said valve beingconfigured such that when said valve is in said first position said oneor more sealing portions block said vent passage.
 36. A chemical sprayeras in claim 35, wherein a single sealing member blocks said chemical,carrier fluid, and vent passages when said valve is in a closedposition.
 37. A chemical sprayer comprising a sprayer head assembly anda container that defines a cavity for storing a chemical to be sprayed;said sprayer head assembly comprising: a chemical passage that is incommunication with said cavity; a carrier fluid passage that is incommunication with a carrier fluid source; a valve chamber that is incommunication with said chemical passage; a valve moveably positionedwithin said valve chamber; said valve defining at least in part a firstpassage that communicates with said chemical passage when said valve isin an open position, said valve also defining a metering orifice that isin communication with said first passage.
 38. A chemical sprayer as inclaim 37, wherein said metering orifice terminates at a suctiongenerating surface that is defined at least partially by said valve. 39.A chemical sprayer as in claim 40, wherein said metering orificeterminates at a graduated suction recess that is located on a suctiongenerating surface that is defined at least partially by said valve. 40.A chemical sprayer as in claim 37, wherein said carrier fluid passage isin communication with said valve chamber and said sprayer furtherincludes one or more sealing portions positioned on said valve so as toblock both the chemical and the carrier fluid passages when the valve isin a closed position.
 41. A chemical sprayer as in claim 38, whereinsaid valve includes a sealing wall that extends across said carrierfluid passage, said one or more sealing portions are located at least inpart on said sealing wall and said valve further includes a bracing wallthat is coupled to said sealing wall at least two points that are onopposite sides of said carrier fluid passage.
 42. A chemical sprayer asin claim 41, wherein said one or more sealing portions do not form asingle piece with said valve.
 43. A chemical sprayer as in claim 42,wherein said valve includes one or more recesses and said one or moresealing portions are positioned within said one or more recesses.
 44. Achemical sprayer as in claim 41, wherein said one or more sealingportions are formed from a single sealing member.
 45. A chemical sprayeras in claim 41, wherein said one or more sealing portions consist of anelastomer.
 46. A chemical sprayer as in claim 41, wherein said one ormore sealing portions forms an annular seal around said chemicalpassage.
 47. A chemical sprayer as in claim 46, wherein said one or moresealing portions are formed from a single sealing member that a includesa transition passage that is in communication with said chemical passageand said first passage when said valve is in said open position.
 48. Achemical sprayer as in claim 41, wherein said assembly further includesa vent passage that is in communication with said cavity and said valvechamber and said valve is configured such that when in said closedposition said valve blocks said vent passage.
 49. A chemical sprayer asin claim 48, wherein said one or more sealing portions block said ventpassage when said valve is in closed position.
 50. A chemical sprayer asin claim 49, wherein said one or more said sealing portions are formedby a single sealing member.
 51. A chemical sprayer as in claim 49,wherein said sealing portion includes a venting channel that is incommunication with said venting passage when said valve is in said openposition.
 52. A chemical sprayer comprising a sprayer head assembly anda container that defines a cavity for storing a chemical to be sprayed;said sprayer head assembly comprising: a chemical passage that is incommunication with said cavity; a carrier fluid passage that is incommunication with a carrier fluid source; a valve chamber that is incommunication with said chemical passage; a valve moveably positionedwithin said valve chamber; said valve defining at least in part a firstpassage that is in communication with said chemical passage when saidvalve is in an open position, said valve further including one or moresealing portions that form an annular seal around said chemical passagewhen said valve is in said open position.
 53. A chemical sprayer as inclaim 52, wherein said one or more sealing portions do not form a singlepiece with said valve.
 54. A chemical sprayer as in claim 53, whereinsaid valve includes one or more recesses and said one or more sealingportions are positioned within said one or more recesses.
 55. A chemicalsprayer as in claim 52, wherein said one or more sealing portions areformed from a single sealing member.
 56. A chemical sprayer as in claim52, wherein said one or more sealing portions consists of an elastomer.57. A chemical sprayer as in claim 52, wherein said carrier fluidpassage is in communication with said valve chamber and said one or moresealing portions are positioned on said valve so as to block both thechemical and the carrier fluid passages when the valve is in a closedposition.
 58. A chemical sprayer as in claim 57, wherein said valveincludes a sealing wall that extends across said carrier fluid passage,said one or more sealing portions are located at least in part on saidsealing wall and said valve further includes a bracing wall that iscoupled to said sealing wall at least two points that are on oppositesides of said carrier fluid passage.
 59. A chemical sprayer as in claim57, wherein said one or more sealing portions do not form a single piecewith said valve.
 60. A chemical sprayer as in claim 59, wherein saidvalve includes one or more recesses and said one or more sealingportions are positioned within said one or more recesses.
 61. A chemicalsprayer as in claim 57, wherein said one or more sealing portions areformed from a single sealing member.
 62. A chemical sprayer as in claim57, wherein said one or more sealing portions consist of an elastomer.63. A chemical sprayer as in claim 57, wherein said assembly furtherincludes a vent passage that is in communication with said cavity andsaid valve chamber and said valve is configured such that when in aclosed position said valve blocks said vent passage.
 64. A chemicalsprayer as in claim 63, wherein said one or more sealing portions blocksaid vent passage when said valve is in said closed position.
 65. Achemical sprayer as in claim 64, wherein said one or more said sealingportions are formed by a single sealing member.
 66. A chemical sprayeras in claim 65, wherein said one ore more sealing portions includes aventing channel that is in communication with said venting passage whensaid valve is in said open position.
 67. A chemical sprayer headassembly comprising: a container connection portion for connecting saidsprayer head assembly to a container containing a chemical solution; achemical passage located at least partially in said container connectionportion; a carrier fluid connection portion for connecting said sprayerhead assembly to a carrier source; a carrier fluid passage located atleast partially in said carrier fluid connection portion connection; avalve chamber that is in communication with said chemical and carrierfluid passages; a valve moveably positioned within said valve chamber atleast partially defining a first passage and a second passage, saidfirst passage is configured so as to be in communication with saidchemical passage when said valve is in an open position, said secondpassage is configured so as to be in communication with said carrierfluid passage when said valve is in said open position, said first andsecond passages also configured so as to not be in communication withsaid chemical and carrier fluid passages when said valve is in a closedposition; said valve further comprising one or more sealing portionspositioned so as to block both the chemical and the carrier fluidpassages when said valve is in said closed position.
 68. A chemicalsprayer head assembly in claim 67, wherein said valve includes a sealingwall that extends across said carrier fluid passage, said one or moresealing portions are located at least in part on said sealing wall andsaid valve further includes a bracing wall that is coupled to saidsealing wall at least two points that are on opposite sides of saidcarrier fluid passage.
 69. A chemical sprayer head assembly as in claim67, wherein said one or more sealing portions do not form a single piecewith said valve.
 70. A chemical sprayer head assembly as in claim 69,wherein said valve includes one or more recesses and said one or moresealing portions are positioned within said one or more recesses.
 71. Achemical sprayer head assembly as in claim 67, wherein said one or moresealing portions are formed from a single sealing member.
 72. A chemicalsprayer head assembly as in claim 67, wherein said one or more sealingportions consists of an elastomer.
 73. A chemical sprayer head assemblyas in claim 67, wherein said one or more sealing portions forms anannular seal around said chemical passage.
 74. A chemical sprayer headassembly as in claim 73, wherein said one or more sealing portions areformed from a single sealing member that a includes a transition passagethat is in communication with said chemical passage and said firstpassage when said valve is in said open position.
 75. A chemical sprayerhead assembly as in claim 67, wherein said assembly further includes avent passage, said valve is configured such that when in said closedposition said valve blocks said vent passage.
 76. A chemical sprayerhead assembly as in claim 75, wherein said one or more sealing portionsblock said vent passage when said valve is in closed position.
 77. Achemical sprayer head assembly as in claim 76, wherein said one or moresaid sealing portions are formed by a single sealing member.
 78. Achemical sprayer head assembly as in claim 77, wherein said sealingmember includes a venting channel that is in communication with saidvent passage and said valve chamber when said valve is in said openposition.
 79. A chemical sprayer head assembly as in claim 67, whereinsaid second passage is defined at least partially by said valve chamber.80. A chemical sprayer head assembly comprising: a container connectionportion for connecting said sprayer head assembly to a containercontaining a chemical solution; a chemical passage located at leastpartially in said container connection portion; a carrier fluidconnection portion for connecting said sprayer head assembly to acarrier source; a carrier fluid passage located at least partially insaid carrier fluid connection portion connection; a valve chamber thatis in communication with said chemical and carrier fluid passages; avalve moveably positioned within said valve chamber; said valve definingat least in part a first passage that is in communication with saidchemical passage when said valve is in an open position an a secondpassage that is also in communication with said carrier fluid sourcewhen said valve is in said open position, said valve defining at leastin part a suction generating surface and said first passage terminatingat said suction generating surface, said suction generating surfacepositioned and configured such that a flow of carrier fluid over saidsuction generating surface creates a suction force that draws a chemicalthrough said chemical passage to said mouth.
 81. A chemical sprayer headassembly as in claim 80, wherein said valve includes one or more sealingportions positioned on said valve such that said one or more sealingportions block said chemical passage when said valve is in a closedposition.
 82. A chemical sprayer head assembly as in claim 81, whereinsaid one or more sealing portions are also positioned on said valve suchthat said one or more sealing portions block said carrier fluid passagewhen said valve is in said closed position,
 83. A chemical sprayer headassembly as in claim 82, wherein said valve further includes a sealingwall that extends across said carrier fluid passage, said one or moresealing portions are located at least in part on said sealing wall andsaid valve further includes a bracing wall that is coupled to saidsealing wall at least two points that are on opposite sides of saidcarrier fluid passage.
 84. A chemical sprayer head assembly as in claim82, wherein said one or more sealing portions do not form a single piecewith said valve.
 85. A chemical sprayer head assembly as in claim 84,wherein said valve includes one or more recesses and said one or moresealing portions are positioned within said one or more recesses.
 86. Achemical sprayer head assembly as in claim 82, wherein said sealing oneor more sealing portions consists of an elastomer.
 87. A chemicalsprayer head assembly as in claim 80, wherein said valve includes one ormore sealing portions positioned on said valve and said one or moresealing portions forms an annular seal around said chemical passage. 88.A chemical sprayer head assembly as in claim 87, wherein said one ormore sealing portions are formed from a single sealing member thatincludes a transition passage that is in communication with saidchemical passage and said first passage when said valve is in said openposition.
 89. A chemical sprayer head assembly as in claim 80, whereinsaid assembly further includes a vent passage, said valve is configuredsuch that when said valve is in a closed position said valve blocks saidvent passage.
 90. A chemical sprayer head assembly as in claim 89,wherein said valve includes one or more sealing portions positioned onsaid valve so as to block said vent passage when said valve is in saidclosed position.
 91. A chemical sprayer head assembly as in claim 90,wherein said one or more sealing portions includes a venting channelthat is in communication with said venting passage when said valve is insaid closed position.
 92. A chemical sprayer head assembly comprising: acontainer connection portion for connecting said sprayer head assemblyto a container containing a chemical solution; a chemical passagelocated at least partially in said container connection portion; acarrier fluid connection portion for connecting said sprayer headassembly to a carrier source; a carrier fluid passage located at leastpartially in said carrier fluid connection portion connection; a valvechamber that is in communication with said chemical and carrier fluidpassages; a valve moveably positioned within said valve chamber; saidvalve defining at least in part a first passage that communicates withsaid chemical passage when said valve is in an open position and asecond passage that communicates with said supply fluid passage, saidchemical passage terminating at a suction generating surface that isformed by said valve, said suction generating surface positioned andconfigured such that the flow of carrier fluid over said suctiongenerating surface creates a suction force which draws chemical throughsaid chemical passage to said suction generating surface, and an outletfor said sprayer head assembly that is formed at least in part by saidvalve.
 93. A chemical sprayer head assembly as in claim 92, wherein saidsuction generating surface is defined at least in part by said secondpassage.
 94. A chemical sprayer head assembly as in claim 92, whereinsaid suction generating surface is upwardly inclined when said valve isin said open position.
 95. A chemical sprayer head assembly as in claim92, wherein said outlet includes divergent walls formed in part by saidvalve.
 96. A chemical sprayer head assembly as in claim 92, wherein saidvalve includes one or more sealing portions positioned on said valve soas to block said chemical passage when said valve is in a closedposition.
 97. A chemical sprayer head assembly as in claim 92, whereinsaid valve includes one or more sealing portions positioned on saidvalve so as to block said chemical and carrier fluid passages when saidvalve is in a closed position.
 98. A chemical sprayer head assembly asin claim 97, wherein said valve includes a sealing wall that extendsacross said carrier fluid passage, said one or more sealing portions arelocated at least in part on said sealing wall and said valve furtherincludes a bracing wall that is coupled to said sealing wall at leasttwo points that are on opposite sides of said carrier fluid passage. 99.A chemical sprayer head assembly as in claim 92, wherein said valveincludes one or more sealing portions that form an annular seal aroundsaid chemical passage when said valve is in said open position.
 100. Achemical sprayer head assembly as in claim 99, wherein said one or moresealing portions are formed from a single sealing member that includes atransition passage that is in communication with said chemical passageand said first passage when said valve is in said open position.
 101. Achemical sprayer head assembly as in claim 99, wherein said assemblyfurther includes a vent passage, said valve being configured such thatwhen said valve is in said first position said one or more sealingportions block said vent passage.
 102. A chemical sprayer head assemblyas in claim 101, wherein a single sealing member blocks said chemical,carrier fluid, and vent passages when said valve is in a closedposition.
 103. A chemical sprayer head assembly comprising: a containerconnection portion for connecting said sprayer head assembly to acontainer containing a chemical solution; a chemical passage located atleast partially in said container connection portion; a carrier fluidconnection portion for connecting said sprayer head assembly to acarrier source; a carrier fluid passage located at least partially insaid carrier fluid connection portion connection; a valve chamber thatis in communication with said chemical and carrier fluid passages; avalve moveably positioned within said valve chamber; said valve definingat least in part a first passage that communicates with said chemicalpassage when said valve is in an open position, said valve also defininga metering orifice that is in communication with said first passage.104. A chemical sprayer head assembly as in claim 103, wherein saidmetering orifice terminates at a suction generating surface that isdefined at least partially by said valve.
 105. A chemical sprayer headassembly as in claim 103, wherein said metering orifice terminates at agraduated suction recess that is located on a suction generating surfacethat is defined at least partially by said valve.
 106. A chemicalsprayer head assembly as in claim 103, wherein said carrier fluidpassage is in communication with said valve chamber and said sprayerfurther includes one or more sealing portions positioned on said valveso as to block both the chemical and the carrier fluid passages when thevalve is in a closed position.
 107. A chemical sprayer head assembly asin claim 106, wherein said valve includes a sealing wall that extendsacross said carrier fluid passage, said one or more sealing portions arelocated at least in part on said sealing wall and said valve furtherincludes a bracing wall that is coupled to said sealing wall at leasttwo points that are on opposite sides of said carrier fluid passage.108. A chemical sprayer head assembly as in claim 107, wherein said oneor more sealing portions do not form a single piece with said valve.109. A chemical sprayer head assembly as in claim 108, wherein saidvalve includes one or more recesses and said one or more sealingportions are positioned within said one or more recesses.
 110. Achemical sprayer head assembly as in claim 107, wherein said one or moresealing portions are formed from a single sealing member.
 111. Achemical sprayer head assembly as in claim 107, wherein said one or moresealing portions consist of an elastomer.
 112. A chemical sprayer headassembly as in claim 107, wherein said one or more sealing portionsforms an annular seal around said chemical passage.
 113. A chemicalsprayer head assembly as in claim 112, wherein said one or more sealingportions are formed from a single sealing member that a includes atransition passage that is in communication with said chemical passageand said first passage when said valve is in said open position.
 114. Achemical sprayer head assembly as in claim 107, wherein said assemblyfurther includes a vent passage, said valve is configured such that whenin said closed position said valve blocks said vent passage.
 115. Achemical sprayer head assembly as in claim 114, wherein said one or moresealing portions block said vent passage when said valve is in closedposition.
 116. A chemical sprayer head assembly as in claim 115, whereinsaid one or more said sealing portions are formed by a single sealingmember.
 117. A chemical sprayer head assembly as in claim 115, whereinsaid sealing portion includes a venting channel that is in communicationwith said venting passage when said valve is in said open position. 118.A chemical sprayer head assembly comprising: a container connectionportion for connecting said sprayer head assembly to acontainer-containing a chemical solution; a chemical passage located atleast partially in said container connection portion; a carrier fluidconnection portion for connecting said sprayer head assembly to acarrier source; a carrier fluid passage located at least partially insaid carrier fluid connection portion connection; a valve chamber thatis in communication with said chemical and carrier fluid passages; avalve moveably positioned within said valve chamber; said valve definingat least in part a first passage that is in communication with saidchemical passage when said valve is in an open position, said valvefurther including one or more sealing portions that form an annular sealaround said chemical passage when said valve is in said open position.119. A chemical sprayer head assembly as in claim 118, wherein said oneor more sealing portions do not form a single piece with said valve.120. A chemical sprayer head assembly as in claim 119, wherein saidvalve includes one or more recesses and said one or more sealingportions are positioned within said one or more recesses.
 121. Achemical sprayer head assembly as in claim 118, wherein said one or moresealing portions are formed from a single sealing member.
 122. Achemical sprayer head assembly as in claim 118, wherein said one or moresealing portions consists of an elastomer.
 123. A chemical sprayer headassembly as in claim 118, wherein said carrier fluid passage is incommunication with said valve chamber and said one or more sealingportions are positioned on said valve so as to block both the chemicaland the carrier fluid passages when the valve is in a closed position.124. A chemical sprayer head assembly as in claim 123, wherein saidvalve includes a sealing wall that extends across said carrier fluidpassage, said one or more sealing portions are located at least in parton said sealing wall and said valve further includes a bracing wall thatis coupled to said sealing wall at least two points that are on oppositesides of said carrier fluid passage.
 125. A chemical sprayer headassembly as in claim 124, wherein said one or more sealing portions donot form a single piece with said valve.
 126. A chemical sprayer headassembly as in claim 125, wherein said valve includes one or morerecesses and said one or more sealing portions are positioned withinsaid one or more recesses.
 127. A chemical sprayer head assembly as inclaim 123, wherein said one or more sealing portions are formed from asingle sealing member.
 128. A chemical sprayer head assembly as in claim123, wherein said one or more sealing portions consist of an elastomer.129. A chemical sprayer head assembly as in claim 123, wherein saidassembly further includes a vent passage, said valve is configured suchthat when in a closed position said valve blocks said vent passage. 130.A chemical sprayer head assembly as in claim 129, wherein said one ormore sealing portions block said vent passage when said valve is in saidclosed position.
 131. A chemical sprayer head assembly as in claim 130,wherein said one or more said sealing portions are formed by a singlesealing member.
 132. A chemical sprayer head assembly as in claim 131,wherein said one ore more sealing portions includes a venting channelthat is in communication with said venting passage when said valve is insaid open position.